_is a common feature of all mammals.
Correct answer: D. Mammary glands
- A. Viviparous
- B. Have placenta
- C. Right aortic arch
- D. Mammary glands
Explanation
Mammary glands are a characteristic of all mammals. These specialized glands produce milk, which is used to nourish and feed the young. The milk is rich in nutrients and antibodies, which help to protect the young from disease and infection. Mammals are named after these glands, which are unique to the class Mammalia.
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